Remove the fuel cap and insert a siphon pump hose into the fuel tank. Pump the fuel into a gas-safe can. Place a piece of duct tape over the fuel tank opening to prevent debris from falling into the tank while you're performing repairs.
Remove the screws from the upper shroud, using a hex-head screwdriver; the number of screws varies by model. Lift the upper shroud off the snowblower to reveal the engine and starter assemblies. Set the removed shroud aside.
Find the rewind starter assembly on the right-hand side of the motor. Remove the locknut securing the rewind assembly to the retainer bracket, using a lock-nut socket wrench.
Remove the hex-head screws that hold the retainer bracket to the rewind starter assembly. Pull the retainer bracket off the starter shaft and set it aside.
Pull the rewind assembly off the starter shaft to troubleshoot, repair or replace it.